def func1():
    x=50
    y=x**0.5-7
    print(y)

def func2():
    x=70
    y=x**0.5-7
    print(y)
    return y

def func3(x):
    y = x**0.5-7
    return y

def func4(x=50):
    y = x**0.5-7
    return y

def func5(a, b, operation="add"):
    if operation == "add":
        return a + b
    elif operation == "subtract":
        return a - b
    else:
        return None
    
def func6(a, /,  b, operation="add"):
    if operation == "add":
        return a + b
    elif operation == "subtract":
        return a - b
    else:
        return None
    
def func7(a, /,  b, *, operation="add"):
    if operation == "add":
        return a + b
    elif operation == "subtract":
        return a - b
    else:
        return None
    
def func8(*numbers):
    total = 0
    for num in numbers:
        total = total + num
    return total

def func9(**user):
    for key, value in user.items():
        print(f"{key}: {value}")

def func10(a, b, c=100):
    print(f"a = {a}, b = {b}, c = {c}")

def func11(x, y=10, z=20):
    print(f"x = {x}, y = {y}, z = {z}")

def func12(a:str, b:int, c:str =100):
    print(f"a = {a}, b = {b}, c = {c}")
    
